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SQL code:
select dateadd(day,-1, convert(varchar(8),dateadd(day,5,'2008-10-28'),120)+'01')


SQL code:
select convert(varchar(10),dateadd(day,-1, convert(varchar(8),dateadd(day,5,'2008-10-28'),120)+'01'),120)
------------
--2008-10-31


SQL code:
declare @dt datetime
set @dt = '2008-10-28'

declare @d int;
set @d = 5;

select
case when convert(varchar(6),dateadd(day,@d,@dt),112)=convert(varchar(6),@dt,112)
then dateadd(day,@d,@dt)
else dateadd(day,-1,dateadd(month,1,convert(varchar(6),@dt,112)+'01'))
end






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